Summary: New research identifies kisspeptin, a brain hormone, as a central regulator of attraction and sexual behavior in female mice.

Source: Saarland University

Single Hormone Links Attraction, Sexual Behavior and Reproductive Timing

A collaborative research team led by Professor Julie Bakker at Liège University (Belgium) and Professor Ulrich Boehm at Saarland University (Germany) has clarified how the brain integrates external sensory information and internal reproductive signals to coordinate sexual behavior. Their findings, published in Nature Communications, reveal that kisspeptin, a peptide produced by neurons in the hypothalamus, connects pheromonal cues, mate preference and copulatory behavior through parallel neural pathways.

How kisspeptin translates scent into sexual responses

Using female mice as an experimental model, the researchers demonstrate that male-emitted pheromones are detected by the female’s vomeronasal organ and activate kisspeptin-producing neurons in the brain. Once activated, these kisspeptin neurons transmit signals through two distinct pathways. One pathway communicates with gonadotropin-releasing hormone (GnRH) neurons to promote olfactory-driven mate preference and attraction to the opposite sex. The other pathway targets neurons that produce nitric oxide, a neurotransmitter that triggers the physiological and behavioral components of copulation.

Professor Ulrich Boehm explains, “This work shows how the brain decodes environmental signals and translates them into coordinated reproductive behavior. In many species, sexual behavior is timed to coincide with ovulation to maximize reproductive success. Until now, the mechanisms that tie together ovulation, attraction and sexual activity were unclear. Our results demonstrate that kisspeptin orchestrates these processes through separate but parallel circuits.”

Implications for human sexual health

Beyond basic neuroscience, these insights may have clinical relevance. The study suggests that a single molecule—kisspeptin—helps synchronize puberty, fertility, attraction and sexual behavior. This raises the possibility of new therapeutic approaches for psychosexual disorders. As Professor Julie Bakker notes, “There are currently limited treatments for women with low sexual desire. The finding that kisspeptin controls both attraction and sexual motivation opens potential avenues for developing targeted therapies for hyposexual desire disorder.”

Research teams: Laboratory of Neuroendocrinology, Liège University; Experimental and Clinical Pharmacology and Toxicology, Saarland University.

Publication: Nature Communications (open access)

Original research summary: The study identifies kisspeptin neurons as a central hub in the female mouse brain that receives pheromonal input and splits this information into two functional streams: (1) classic kisspeptin signaling via Kiss1R to regulate mate preference and olfactory-driven attraction, and (2) a Kiss1R-independent pathway involving nitric oxide signaling to control copulatory behavior. Anatomical and functional data show that kisspeptin neurons connect with nitric oxide-synthesizing neurons in the ventromedial hypothalamus, supporting the model of parallel circuits for distinct aspects of sexual behavior.

Abstract

Female sexual behavior in mice is controlled by kisspeptin neurons

Sexual behavior is essential for the survival of many species. In female rodents, mate preference and copulatory behavior depend on pheromones and are coordinated with ovulation to ensure reproductive success. The neural circuits driving this orchestration in the brain have remained unclear. This study demonstrates that neurons that control ovulation sit at the center of a branching neural circuit that governs both mate preference and copulatory behavior. Male odors detected by the vomeronasal organ activate kisspeptin neurons in female mice. Kisspeptin/Kiss1R signaling drives olfactory-driven mate preference, whereas copulatory behavior is elicited by kisspeptin neurons through a parallel, Kiss1R-independent circuit involving nitric oxide signaling. Kisspeptin neurons project to nitric oxide-synthesizing cells in the ventromedial hypothalamus. These findings position kisspeptin neurons as a central regulatory hub orchestrating sexual behavior in the female mouse brain.

Source: Friederike Meyer zu Tittingdorf, Saarland University

Publisher: NeuroscienceNews.com

Original paper: Nature Communications; DOI: 10.1038/s41467-017-02797-2